Jacketed extrusion device



June 1936- I c. T. WALTER 2,043,686

JACKETED EXTRUSION DEVICE Filed Dec. 7, 1934 Sheets-Sheet 1 g I I Q I I I 28 40; I I 30 59 I 29 In l 39 27 I I i??? 33 I I 26 25 I 24 8a, I I 7 42 19a I a I 1T1 l I I 22 I I I I 1 41 2 I I I 19 f I I I W I 20 I i 5 I I I z J :5 v, I; i r

A z. -1. I 2 15 I II I I 76 L1: 1 g I II I (fiarles I." WdZZer fly J INVENTOR BY Wfna$s- I J8 9, 1936. Q T WA 2,043,686

JACKETED EX'IRUSION DEVICE Filed D90. 7, 1934 2 Sheets-Sheet 2 Charles- 7: Walfzr KNVENTOR ATTORNEY Patented June 9, 1936 UNITED STATES amass .moxs'mn EXTRUSION nsvros Charles T. Walter, Chicago, 111., assignor to Industrlal Patents Corporation, Chicago, 111., a corporation of Delaware Application December'l, 1934, Serial No. 758,472

6 Claim.

This application relates to extrusion devices.

One of the objects of the invention is to, provide a jacketed extrusion device.

Another object of the invention is to provide an extrusion device for extruding plastic material in the form of a thin-walled tube.

' Another object of the invention is to provide an extrusion device for extruding plastic material in the form of a collapsed ribbon-like tube.

Another object of the invention is to provide a jacketed extrusion device for developing a smooth giossy surface on the material extruded therefrom.

Other objects of the invention will be apparent from the description and claims which follow.

In my application, Serial No. 703,350, filed December 21, 1933, entitled Soap product and method of making the same, and in my divisional appllcation, Serial No. 737,345, filed July 28, 1934, entitled Method of making tube soap, I describe a novel form of soap which may be formed as thin-walled tubes or as ribbons.

As pointed out in my said applications, I have found that tube or ribbon soap prepared in accordance with the inventions there described and claimed, may be given a glossy finish by heating the nozzle of the extrusion plate to a temperature of 160 to 180 Fahrenheit.

The action of the heated nozzle would seem to produce a skin effect on the extruded soap, a very thin film of soap being heated and probably melted. The depth of this heating effect is not sufllcient to materially affect the strength of the extruded tube. After being in contact with cool air for a few seconds after leaving the extrusion die, the more or less molten outside film or skin solidifies into a smooth glossy surface which is thereafter retained indefinitely.

The nozzle of the extrusion die may be heated by means of a hot water jacket around its lower end, which provides enough heat to the apparatus to compensate for the heat removed by the stream of soap flowing through it; 'thus maintaining a constant temperature. Soap containing tiller, heat treated as has just been described, gives every appearance of a milled soap not containing filler.

In carrying out the method of the present inventlon I prefer to use an extrusion device of the type described and claimed in my application, Serial No. 703,351, filed December 21, 1933, entitled Extrusion device.

Although it will be understood that other means such as an electrical heating element may be used, I prefer'to use hot water in a jacketed extrusion nozzle such as shown in the accompwing drawings.

Figure 1 is a sectional view of a preferred embodiment of a water jacketed nozzle.

Figure 2 is a section on line 22 of Figure 1.

Figure 3 is a perspective view, partly in section, of a preferred embodiment of the product of the present invention. a

Figure 4 is a sectional view of another embodiment of the product of the present invention.

Figure 5 is a plan view of the upper portion of the device shown in Figure 1.

Figure 6 is a section taken on line 6-6 of Figure 1.

Referring now, more particularly. to Figures 1, 2,5and 6:

Within casing I is a chamber 2 into which soap in a plastic, semi-liquid condition may be -forced under pressure through pipe 3 which is threaded in boss 4. Spindle 5 is rotatably mounted within casing l and terminates in an extrusion pin 6. Bearing 1 is a thrust ball bearing and takes the thrust load imposed on spindle 5 by virtue of the hydraulic pressure within chamber 2.

This thrust load is transmitted directly to bearing 1 by flange 8 which is integral with spindle 5, rotates in stufling box 811, and is separated from bushing ill by washer l9a. End plate 9 which is screwed into casing l by threads l0, and-which cooperates with casing I to form a housing, is provided with extrusion orifice II and base of conical recess I2 in which fits conical end I 3 of the spindle 5. Wrench recesses l4 and I5 are provided in end plate 9 to facilitate removal and insertion of the end plate which serves as an extrusion plate.

End plate 9 is guided and held rigidly in a center position with respect to the body portion by means of cylindrical guiding portions l6 and I1. Shoulder l8 limits the depth to which the plate 9 may be screwed into the casing l. Stufilng box I9 is a cast iron bushing having a press fit in the bore 20 of the body, and acts as a bearing which performs the dual function of guiding the upper end of the spindle 5 in a radial direction.

The stuffing box I9 is preferably machined on the inside so as to form a very close running fit with the enlarged portion 2| of the rotating spindle 5. Stuffing box bushing H has an internal groove 22 vented to the outside surface and serves .to carry the thrust transmitted 56 through bearing "I. It will be noted that nut 24 is designed to screw down solidly against shoulder 26. Flat surfaces are preferably provided on the portion 21 of nut 24 to provide suitable bearing surfaces for a wrench. The upper extremity 23 of nut 24 is machined to a smooth surface to provide a bearing for sprocket 29 which contains a suitable bronze bushing 30. Bushing 30 is designed to permit the sprocket 23 to rotate freely about a bushing portion 28 of nut 24. The driving end 3| passes up through a concentric hole 32 in nut 24. A slight amount of clearance between the driving end 3i of the spindle and nut 24 is indicated at 33. The amount of clearance is not important, it being merely desirable that driving end 3| of spindle 5 not contact the surface of concentric hole 32 in nut 24 since nut 24 is not utilized as a bearing for spindle 6. Flange 34 is firmly attached to the upper end. of spindle 5 as by keying or otherwise and is secured to sprocket 23 by bolts 35, 36, 31, and 38, whereby driving force is transmitted from sprocket 29 to spindle 5. Bending and shearing forces resulting from the chain drive on the teeth 39 of sprocket 23 are resisted by bearing 40 and are transmitted directly to the rigid body of casing I, and consequently only a pure torque is transmitted to the spindle. A breather hole 4| runs the entire length of spindle 5 with an opening at the end of extrusion pin 6.

A flange 42, having holes 43 and 44, is integral with casingi and is provided in order that the entire device may be bolted against any suitable supporting member.

Casing I is provided with water jacket chamber 46 through which hot water is circulated by way of pipes 48 and 41.

In operation, plastic soap is forced under hydraulic pressure through pipe 3 and thence into chamber 2. From chamber 2 the soap passes through conical passage I2 which leads to the extrusion opening I I and is distributed uniformly around the spindle head I3, passing out extrusion orifice i I around extrusion pin 8.

Tube soap in the form illustrated in Figure 3 may be formed at the rate of one hundred feet per minute with the spindle rotating at the rate of R. P. M. In such case it is sufiicient merely to leave the breather tube 4| open to prevent collapse of the tube. If it is desired to operate the device at a greater rate of speed, for example to produce tubes at the rate of four hundred feet per minute, the spindle is rotated at the rate of 100 R. P. M. and air is supplied to the breather tube at a pressure of about six to ten inches of water. If it is desired to form ribbons as illustrated in enlarged section in Figure 4, it is desirable to pull a vacuum of about inch of water on the breather tube to eflectually collapse the tube to a flattened ribbon.

The preferred commercial form of the tube soap of the present invention is a plurality of individual pieces having an outside'diameter of from .07 to .09 inch and a wall thickness of from .0035 to .0055 inch. The individual pieces may be from one-fourth inch to three-fourths inch in length, being prepared by cutting, as desired, long tubes extruded from the extrusion device in the manner already described.

In the production of the product of the present invention, hot water, preferably at a temperature of about F. is circulated in water jacket 45, care being taken to keep the water temperature fairly constant at that point. The soap enters the device at a temperature of about 70 F. or

lower and is extruded in the form of a tube or .ribbon as desired. The heat from the water Jacket is transmitted through the metal of the extrusion plate and the resulting instantaneous heating efiect brings about a highly glossed 5 appearance in the product after extrusion. If desired steam or electricity could be used instead of hot water, suitable provision being made in the extrusion nozzle. The glossed appearance in the product would appear to be the result of melting 10 the outer surface of the tube as it is being formed, permitting the surface particles to run together to form a glaze-like film exhibiting a high polish. The same result may be secured in like manner with the ribbon product. 15

I claim:

1. An extrusion die comprising a housing having a chamber for the reception of plastic semiliquid material under pressure and provided with an extrusion plate provided with an extrusion 20 orifice and a spindle rotatable in said housing, a water Jacket in said housing whereby heat may be conducted by said extrusion plate to said extrusion orifice and a rotatable extrusion pin located centrally of the orifice, said extrusion pin 23 and the walls of the orifice presenting smooth surfaces to the material and permitting a continuous uninterrupted fiow oi. the material under pressure.

2. An extrusion die comprising a housing hav- 3o ing a chamber for the reception of plastic semiliquid material under pressure and provided with an extrusion plate provided with an extrusion orifice and a spindle rotatable in said housing, heating means in said housing whereby heat may be conducted by said extrusion plate to said ex-- trusion orifice and a rotatable extrusion pin located centrally of the orifice, said extrusion pin and the walls of the orifice presenting smooth surfaces to the material and permitting a continuous uninterrupted flow of the material under pressure.

3. An extrusion die comprising a. housing having a chamber for the reception of plastic semiliquid material under pressure and provided with an extrusion plate provided with an extrusion orifice and a spindle rotatable in said housing, a water jacket in said housing whereby heat may be conducted by said extrusion plate to said extrusion orifice and a rotatable extrusion pin lo cated centrally of the orifice, said extrusion pin and the walls of the orifice presenting smooth surfaces to the material and permitting a continuous uninterrupted flow of the material under pressure, said extrusion pin being integral with 55 said spindle and rotatable therewith.

4. An extrusion die comprising a housing having a chamber for the reception of plastic semiliquid material-under pressure and provided with an extrusion plate provided with an extrusion orifice and a spindle rotatable in said housing, heating means in said housing whereby heat may be conducted by said extrusion plate to said extrusion orifice and a rotatable extrusion pin lo cated centrally of the orifice, said extrusion pin 65 and the walls of the orifice presenting smooth surfaces to the material and permitting a continuous uninterrupted flow of the material under pressure, said extrusion pin being integral with said spindle and rotatable therewith.

5. An extrusion die comprising a housing having a chamber for the reception of plastic semiliquid material under pressure and provided with an extrusion plate provided with an extrusion orifice and a spindle rotatable in said housing, a 76 water jacket in said housing whereby heat may be conducted by said extrusion plate to said extrusion orifice and a rotatable extrusion pin located centrally of the orifice, said extrusion pin and the walls of the orifice presenting smooth surfaces to the material and permitting a continuous uninterrupted flow oi the material under pressure, said extrusion pin being integral with said spindle and rotatable therewith and a breather hole running lengthwise of said spindle and pin.

6. An extrusion die comprising a housing having a chamber for the reception of plastic semiliquid material under pressure and provided with an extrusion plate provided with an extrusion orifice and a spindle rotatable in said housing, heating means in said housing whereby heat may be conducted by said extrusion plate to said extrusion orifice and a rotatable extrusion pin located centrally of the orifice, said extrusion pin and the walls of the orifice presenting smooth surfaces to the material and permitting a continuous uninterrupted flow of the material under pressure, said extrusion pin being integral with said spindle and rotatable therewith, and a breather hole running lengthwise of said spindle and pin.

CHARLES T. WALTER. 

